Trademarks are not registered across the board. Rather, it must be listed for which goods and/or services your trademark is to be protected. This list of goods and services is therefore an important part of the trademark application, which is incomplete without such a list.
The goods and services to which trademark protection extends are organized into (Nice) classes. The trademark classification determines the claimed areas (classes) of the goods or services for which a trademark can be protected.
This trademark classification is divided into 45 classes using an internationally uniform system, the “Nice Classification”.